P19416: Indoor Dry Toilet Base and Manufacturing

Detailed Design

Table of Contents

1 Team Vision for Detailed Design Phase
2 Progress Report (11/30/18)
3 Prototyping, Engineering Analysis, Simulation
4 Bill of Material (BOM)
5 Test Plans
6 Risk Assessment
7 Questions for Haiti
8 Design Review Materials
9 Gantt Chart
10 Plans for next phase

Team Vision for Detailed Design Phase

For this phase, we decided to work on testing for our diverter design, determine a tubing method, and decide how our toilet seat will be made.Testing was done to get a better understanding of the diverters strength and durability by using Fusion. Additionally,the development of the mold for the base will take place during this phase as well. We were able to gather information on the cement lab on campus at RIT and plan for its use during MSD II. While using Fusion, we will continue to compute additional tests on the design which will be covered later next phase.

Content related to this phase can be found in the Detailed Design Documents directory.

Progress Report (11/30/18)

What does the team plan to accomplish by the Detailed Design Review?

By the detailed design review we plan to have an optimal tubing method, testing on the diverter using fusion completed, and a decision on how our toilet seat will be created.

What tasks have been accomplished so far?

So far we have determined three options for our tubing method. With the three methods we have developed a list of pros and cons for each. From there we will choose our best option. Additionally, we have begun testing for our diverter with Fusion.

What tasks remain, and who is the owner of each?

Our next tasks is to develop our results from testing the diverter, choosing our optimal tubing method, and discuss toilet machining options. All of which we will be developing as a team.

What decisions have been made so far?

We have decided so far that our best option is to continue with buying our toilet seat instead using the vacuum former to create the seat.

What questions does the team have for the customer and/or guide in order to continue moving forward?

Should we switch to HIPS plastic to create our diverter instead of ABS?

P.O.R.T.A

Prototyping, Engineering Analysis, Simulation

Tubing Method

During this phase we wanted to determine the best option for connecting the jug to the diverter for liquid to pass through without spilling. To determine our optimal tubing method we selected three options that could be a potential solutions as seen below.

Hose Clamp

Hot Glue

Slip Fit

Flare Tip

Based on the methods selected, as a team we came up with pros and cons of each. With the pros and cons listed we rated them on how much either pro or con will positively or negatively affect our toilet design. As a result, we took our ratings and calculated a final rating for each method. Hose Clamp had the highest overall final rating of 0.14 among the three methods making this our optimal tubing option.

Tubing Method Choice

HIPS v. ABS

During this phase we found an alternative option for the material used to create the diverter. After our meeting in the construct, High plastic polystyrene (HIPS) was brought to our attention as a better material to work with to create the diverter.

Compared to ABS, HIPS properties can be seen below:

HIPS v. ABS

Either option is acceptable. However, our final choice of material will be based on the availability of either plastic in Haiti.

Toilet Design

Toilet Design 1

See through drawings of our 3D model showing the overall packaging of the design.

Toilet Design 2

A three-quarter view of our design showing the outside appearance, along with a wireframe view further visualizing the location of all components.

Base Stress Test

Image from Fusion 360 showing the stresses exerted on the base during normal use. It proves that our design is more that strong enough to handle all forces being applied.

Diverter Design

Image from Fusion 360 showing a isometric view of our new diverter design.

Diverter Design 2

Image from Fusion 360 showing a top view of our new diverter design.

Diverter Stress Test

Image from Fusion 360 showing a front view of our new diverter design. This makes the change in lower funnel location very visible. Stress testing for the diverter is also shown. Our design is more than capable of handling the weight of the tubing.

Bill of Material (BOM)

Below is our current Bill of Material, item list, pricing, and budget for the components for our toilet design.

Bill of Material

Purchasing

Test Plans

After going over our engineering requirements we constructed a set of test plan to follow in order to ensure the requirements are being met seen below. Our test plans can also be found here Test Plans Spreadsheet

Test Plans

Risk Assessment

For this phase we updated of Subsystems Design Risks with further risks we may anticipate to encounter as we worked through our detailed design. Included below is the likelihood and severity of each risks.

Risks

Since our risks are updated continuously we have a live document to maintain any knew risks we may encounter. Risks Live Document

Questions for Haiti

During this phase we came up with various questions we have for citizens in Haiti regarding our toilet design. A document has been created containing our questions found here Haiti Questions